From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: send response to test link signal
Patch-mainline: v4.19-rc1
Git-commit: 0d86caff06363151df21603eb1f4e3207ea91bd2
References: FATE#325698, LTC#167867, bsc#1113481
Description: smc: Latest upstream fixes and extensions up to 8/17/2018
Upstream-Description:
net/smc: send response to test link signal
With SMC-D z/OS sends a test link signal every 10 seconds. Linux is
supposed to answer, otherwise the SMC-D connection breaks.
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
net/smc/smc_ism.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -184,6 +184,37 @@ struct smc_ism_event_work {
struct smcd_event event;
};
+#define ISM_EVENT_REQUEST 0x0001
+#define ISM_EVENT_RESPONSE 0x0002
+#define ISM_EVENT_REQUEST_IR 0x00000001
+#define ISM_EVENT_CODE_TESTLINK 0x83
+
+static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
+{
+ union {
+ u64 info;
+ struct {
+ u32 uid;
+ unsigned short vlanid;
+ u16 code;
+ };
+ } ev_info;
+
+ switch (wrk->event.code) {
+ case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
+ ev_info.info = wrk->event.info;
+ if (ev_info.code == ISM_EVENT_REQUEST) {
+ ev_info.code = ISM_EVENT_RESPONSE;
+ wrk->smcd->ops->signal_event(wrk->smcd,
+ wrk->event.tok,
+ ISM_EVENT_REQUEST_IR,
+ ISM_EVENT_CODE_TESTLINK,
+ ev_info.info);
+ }
+ break;
+ }
+}
+
/* worker for SMC-D events */
static void smc_ism_event_work(struct work_struct *work)
{
@@ -196,6 +227,9 @@ static void smc_ism_event_work(struct wo
break;
case ISM_EVENT_DMB:
break;
+ case ISM_EVENT_SWR: /* Software defined event */
+ smcd_handle_sw_event(wrk);
+ break;
}
kfree(wrk);
}